Mentiee



(No Model.)

J E PARMENTIBR SGYTHB SHARPENING APPARATUS.

Patented Aug. 27, 1889.

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UNITED STATES PATENT OFFICE.

JOHANN EDUARD PARMENTIER, OF ELBERFELD, GERMANY.

SCYTHE-SHARPENING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 409,753, dated August 27, 1889.

Application filed April 19,1889l Serial No. 807,873. (No model.) Patented in GermanyDeeember 10,1888,No.8,762,a11d in France January 2l, 1889, No. l95,509|

To a/ZZ wiz/0m, it may concern:

Be it known that I, JOHANN EDUARD PAR- MENTIEE, chemist, a subject of His Majesty the Emperor of Germany, and a resident of the city of Elberfeld, in the Province of Rhenish Prussia, Germany, have invented a new and useful Improvement in an Apparatus for Sharpening Soythes, (for which I have obtained a patent in Germany, provisionally numbered No. 3,762, bearing date December 10, 1888, and in France, No. 195,509, bearing date January 2l, 1889,) of which the following is a specification.

My invention relates to a scyth e-sharpenin g apparatus in which the sharpening is effected by striking either a direct or an indirect blow with a hammer upon the blade of the scythe, lying with its edge on an exchangeable anvil of a specially-shaped face, being placed in a larger anvil-block, which at the same time serves as a guide and as a support for the scythe. The apparatus enables any ineXpert Workman to do the sharpening properly.

It is a known fact that the sharpening of a Scythe, to be good, must be equal along the edge of the same, and the cutting or thin part must be made narrower or wider, according` to the hardness of the crops to be cut. This can only be performed by expert men j with the means used hitherto-t'. e., a more or less flat anvil, with straight edges of hardened steel-by giving the body a painful and fatiguing position, because the scythe has to be carefully held in proper position, and because a wrong blow of the hammer would cause the edge of the blade to become deformed and full of fissures. These defects are avoided by the use of my improved apparatus, whereby an inexpert man can sharpen a scythe according to the best methodnamely, with a broad-faced hammer upon a narrow-faced anvil. Of course the material used must be of best quality throughout to prevent wear and tear, which occurs when a pointed hammer strikes upon a fiat anvil, or when a broad hammer-face strikes upon a sharp anvil, where the broad part is hollowed out and becomes useless in consequence of the blows being hit constantly on one and the same spot. The parts most exposed to wear and :tear are made interchangeable, so that they can be conveniently and cheaply replaced by new ones without loss of time, which is of importance in harvest-time.

My new sharpening apparatus is shown on the accompanying drawings, in which similar letters refer to similar parts.

Figure l is a side view, and Fig. 2 is a plan, of the apparatus without stand, full size. Fig. 8 is a front view with stand, half size. Fig. i: a b c are respectively a front view, side view, and a plan of an ordinary anvil. Fig. 5: a b c are respectively a front view, side view, and a plan of my special anvil. Fig. 6 is a perspective view, part of stand being broken off.

One of the main features of the apparatus is that within a large anvil a is placed a small one a', the face of which has the shape of the cutting-edge to be desired and which is eX- changeable. At the sides ofthe first are fixed plates g g, which are adjustable vertically in order to obtain a larger bearing-surface for the scythe. These plates are made of angle form or flanged, so as to be well guided on the anvil-block a, Fig. 2, and they are provided with adjustable set-screws b b fixed by a checknut and serving for adjusting the width of the sharpening-edge. They project a little above the anvil-face and beyond the upper edge of the plates g g, so that they can bear against the cutting-edge of the scythe.

In order to get a good and exact bearing of the scythe on the face of the anvil, I use springs f f, which may be fixed in an adjustable manner at the back of the anvil-block a or on the plates g, and they are so adjusted with the latter that the upper surface of the plates and the lower pressure-surface of the springs are in a line with the face of the anvil a. Now the scythe is pushed between the springs and the bearing-surface of the plates g, with its concave side downward, until it meets the set-screws b b, and by their means the width of the sharpening-edge is regulated. The workman can do the sharpening by striking with a suitable hammer direct upon the scythe on the anvil a. and by gradually shift- IOO must be obtained, the forni of it being given beforehand by the shape of the anvil-face and the uualterable width of the cutting-edge. Now it very easily happens that in sharpening a scythe, especially so when the sharpening is done by mechanical means, the scythe is deformed, and when the man performing the Work does not guide the scythe properly, so that the blows of the Scythe-hammer will neutralize this deforming action, the cutting-edge becomes full of fissures. In order to avoid this defect, I have invented and designed. a scythe or sharpening anvil of special construction for my apparatus as it is shown in Fig. 5. This anvil o has a face of special shape, its circumference being curved, circular, or elliptical, as shown by Fig. 5, c, and the edges being broken obliquely.

It will be easily understood that with an anvil having a face with straight edges the blow of the hammer will act upon the whole length of the face equally and a deformation of the blade of the scythe must take place, because the metal of the scythe is not only driven outward to form the cutting-edge, but it is also driven sidewise right and leftin the direction of the edge of the scythe, and therefore the blade will be deformed. If, however, a hammer with a flat face acts upon ascythe lying on an anvil having a face with curved edges, the metal of the scythe will be displaced also in a curved form, the displacement diminishing gradually toward the right and left, and these curves will be bent in the opposite direction to the main curvature of the scythe, and therefore no deformation of the blade will take place. Now, if the blows are driven one immediately after the other in continuous succession, these little curves, one covering always the other partly, will form a continuous line, making the cuttingedge 0f the scythe.

There is another advantage gained by shaping the face of the anvil as described. The displaced metal being allowed to go out in different directions, no upsetting takin gplace, it willbe easily understood that the blows need not be as heavy as with anvils having a rectangular face. Practical trials have also confirmed this.

In order to perfect the apparatus in such a manner that also inexpert men can produce an exact and good sharpening, I iix to the back of the anvil a a forked bracket e., which carries the Scythe-hammer c, and to which it serves as a vertical guide. This Scythe-hammer has a slightly-convex or a flat face, and is driven down by an ordinary hammer, andso the sharpening is done `by indirect blows. The bracket is made open in the middle in order that the operator can look through between the two arms and can always control the effect of the blow upon the scythe.

In order to prevent holes being struck into the face of the Scythe-hammer, as would be the case by the continuous action of a hammer on an anvil on the same place, and thus making either of them or both useless for end laid into a groove in the upper part of thehammer, whereas the lower end of the spring is also wound and laid into a groove formed by a ring 7c and the top of the boss of the bracket e, to which the end of the spring is also fixed in some convenient manner. It may also be effectuated by providing the hammer-bolt with a recess d', as shown in dotted lines, Fig. l, and limiting its stroke by a set-screw d2. The boss of the bracket c is then made a little longer.

The same object of allowing the hammerbolt to be turned and limiting its stroke may be obtained by driving a pin d3 through the hammer below the boss-ot' the bracket e.

By means of the Scythe-sharpening apparatus described the workman can give the blows according to the required hardness of the scythe, whether he works direct or by using the intermediate Scythe-hammer c.

For the purpose of making the implement quite independent of any other support for fixing it, I provide it further with a foot or socle-m, which has two arms Z Z iixed to it, Fig. 3. These arms Z Z serve as supports for the legs of the workman, so that, having the apparatus between the legs, he presses it downward, so that it cannot be shifted either way and does not require any other foundation, but may be placed anywhere on the ground, sand, or stone ready for use.

I am aware that mechanical Scythe-sharpening apparatus have been in use before,and I do not claim such an apparatus, broadly; but

What I claim isl. In a Scythe-sharpening apparatus, the combination of the main block a, with the exchangeable Scythe-anvil a', placed into the former and having a face of such shape as to correspond to the form of the cutting-edge to be obtained, the supporting-plates g g, iixed at the sides of the block a, so that they are adjustable vertically, and provided with setscrews Z) l) or pins in their place for horizontal adjustment of the scythe, and the pressure-springs ff, fixed to the block a and being adjustable vertically thereon or fixed to the plates g, as set forth, and for the purpose described. 4

2. An' exchangeable anvil 0, having a face with a curved circumference and obliquelybroken edges, as described, and shown by Fig. 5.

3. In combination with the apparatus described in claim 1, the bracket e, holding and guiding in its boss the hammer-bolt c, capable of being turned round its vertical axis and pushed upward by a spiral spring d.

IOO

IIO

4. In combination with the apparatus de- In testimony that I claim the foregoing I scribed in claims l and 3, a socle m, being' have hereunto set my hand. provided with the angle-bars Z Z serving as supports for the legs of the operator and for 5 holding` the apparatus firmly by pressing it IVit-nesses:

to the ground by the legs resting on the OSCARADOLF EULENBERG, bars Z Z. KARL FRUCHT.

JOHANN EDUARD PARNlENTI-ER. 

